Somewhere else I posted that my guidance booklet suggested that I utilize 14mL of light oil on another calfskin wheel (T7). I don't remember a suggestion in the booklet for extra oil to restore the calfskin. My calfskin wheel gets rare use along these lines, probably, the oil dissipates and abandons a concentrate of glue, spent crushing particles, and steel burr. It is dark. Anyway, how would I revive (restore) the calfskin?